On 13.10.2025 10:35, Maxime Ripard wrote:
> The CMA code, in addition to the reserved-memory regions in the device
> tree, will also register a default CMA region if the device tree doesn't
> provide any, with its size and position coming from either the kernel
> command-line or configuration.
>
> Let's register that one for use to create a heap for it.
>
> Reviewed-by: T.J. Mercier <[email protected]>
> Signed-off-by: Maxime Ripard <[email protected]>
Acked-by: Marek Szyprowski <[email protected]>
> ---
> kernel/dma/contiguous.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
> index
> d67e95094749d45f43c1809c175e491a3f55b2e1..d8fd6f779f797f711b8e0fd628f868d644b8f784
> 100644
> --- a/kernel/dma/contiguous.c
> +++ b/kernel/dma/contiguous.c
> @@ -240,17 +240,23 @@ void __init dma_contiguous_reserve(phys_addr_t limit)
> selected_size = max(size_bytes, cma_early_percent_memory());
> #endif
> }
>
> if (selected_size && !dma_contiguous_default_area) {
> + int ret;
> +
> pr_debug("%s: reserving %ld MiB for global area\n", __func__,
> (unsigned long)selected_size / SZ_1M);
>
> dma_contiguous_reserve_area(selected_size, selected_base,
> selected_limit,
> &dma_contiguous_default_area,
> fixed);
> +
> + ret = dma_heap_cma_register_heap(dma_contiguous_default_area);
> + if (ret)
> + pr_warn("Couldn't register default CMA heap.");
> }
> }
>
> void __weak
> dma_contiguous_early_fixup(phys_addr_t base, unsigned long size)
>
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
